diff --git a/tests/src/Core/Config/PConfigurationTest.php b/tests/src/Core/Config/PConfigurationTest.php
index 1d5e9c0a1..5554731bf 100644
--- a/tests/src/Core/Config/PConfigurationTest.php
+++ b/tests/src/Core/Config/PConfigurationTest.php
@@ -460,7 +460,7 @@ abstract class PConfigurationTest extends MockedTest
 	public function testInvalidUid()
 	{
 		// bad UID!
-		$uid = null;
+		$uid = 0;
 
 		$this->testedConfig = $this->getInstance();